An Ethereum Dencun upgrade is expected to take place on March 13th, 2024.
Fireblocks currently supports Ethereum Dencun on all the Ethereum testnets: Goerli, Sepolia, and Holesky, and once the expected upgrade is implemented on March 13th, we will also support the Ethereum Dencun mainnet.
We do not expect any system downtime due to this upgrade. You are not required to take any action before or after this upgrade.
Update (Mar 13 2:00 pm UTC): Fireblocks completed the Dencun upgrade successfully.